Green silicate long afterglow luminescent material and preparation method thereof

A technology for long-lasting luminescent and luminescent materials, which is applied in the preparation of the luminescent materials, long-lasting luminescent materials, and silicate long-lasting luminescent materials. It can solve the problems of improving the intensity and duration of afterglow luminescence, and achieve good chemical stability. and thermal stability, the effect of simple preparation method

Active Publication Date: 2017-09-22
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with aluminate long afterglow materials, the afterglow luminous intensity and duration of silicate long afterglow materials still need to be improved.

Method used

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  • Green silicate long afterglow luminescent material and preparation method thereof
  • Green silicate long afterglow luminescent material and preparation method thereof
  • Green silicate long afterglow luminescent material and preparation method thereof

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preparation example Construction

[0020] The preparation method of the green silicate long afterglow luminescent material is specifically carried out according to the following steps:

[0021] Step 1: To contain potassium ion K + , Barium ion Ba 2+ , silicon ion Si 4+ , rare earth ion Eu 2+ and R III The compound is the raw material, according to the chemical expression K 2 Ba 7-x-y Si 16 o 40 : xEu 2+ , yR III The stoichiometric ratio of each element in the raw material is weighed, and in the chemical expression, R III is the rare earth ion Tb 3+ 、Ce 3+ 、Dy 3+ 、Tm 3+ 、Nd 3+ 、Gd 3+ , Y 3+ 、Er 3+ , La 3+ 、Pr 3+ 、Sm 3+ , Yb 3+ 、Lu 3+ 、Ho 3+ one or both of the

[0022] Grind and mix the obtained raw material powders evenly;

[0023] Step 2: Put the raw material powder obtained in Step 1 in an environment with a temperature of 1050°C to 1250°C, and calcinate in a reducing atmosphere for 3 to 6 hours;

[0024] Three kinds of gases can be used in the reducing atmosphere: the first is ammoni...

Embodiment 1

[0029] press K 2 Ba 6.98 Si 16 o 40 : 0.01Eu 2+ , 0.01Ho 3+ Stoichiometric ratio shown in molecular formula, weigh 0.0691g K 2 CO 3 , 0.6887g BaCO 3 , 0.4807g SiO 2 , 0.0009g Eu 2 o 3 and 0.0009g Ho 2 o 3 As a raw material, the weighed raw materials are ground and mixed evenly, put into an alumina crucible, placed in an environment with a temperature of 1250 ° C, and calcined for 3 hours in a reducing atmosphere. The reducing atmosphere is composed of 95% nitrogen and 5% nitrogen by volume. Composition of hydrogen gas, the calcined raw material powder is cooled to room temperature with the furnace to obtain a calcined product; after grinding, a luminescent material is obtained. figure 1 Shown is the XRD pattern of the luminescent material, indicating that the phase of the luminescent material is K 2 Ba 7 Si 16 o 40 . Excitation and emission spectra of the luminescent material, such as figure 2 As shown, the figure shows that the emission spectrum of the long...

Embodiment 2

[0031] press K 2 Ba 6.99 Si 16 o 40 : 0.005Eu 2+ , 0.005Nd 3+ The stoichiometric ratio shown in the molecular formula weighs 0.0691gK 2 CO 3 , 0.6897g BaCO 3 , 0.4807g SiO 2 , 0.0004g Eu 2 o 3 and 0.0005g Nd 2 o 3 As a raw material, the weighed raw materials are ground and mixed evenly, put into an alumina crucible, placed in an environment with a temperature of 1150 ° C, and calcined for 5 hours under a reducing atmosphere. The reducing atmosphere is composed of 75% nitrogen and 25% by volume. Composition of hydrogen gas, the calcined raw material powder is cooled to room temperature with the furnace to obtain a calcined product; after grinding, a green silicate long-lasting luminescent material is obtained. Figure 5 0.0010g sample K 2 Ba 6.99 Si 16 o 40 : 0.005Eu 2+ , 0.005Nd 3+ The pyrolysis spectrum measured after the light source with a wavelength of 254nm and a light source with a wavelength of 365nm irradiated for 2 minutes at the same time. It can b...

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Abstract

The invention relates to a green silicate long afterglow luminescent material and a preparation method thereof. The luminescent material has a chemical formula of K2Ba7-x-ySi16O40:xEu<2+>, yR<III>; wherein x is greater than or equal to 0.001 and smaller than or equal to 0.5, y is greater than or equal to 0 and smaller than or equal to 0.5. The preparation method includes: taking compounds containing potassium ion K<+>, barium ion Ba<2+>, silicon ion Si<4+>, rare earth ion Eu<2+> and R<III> as the raw materials, weighing the raw materials according to a stoichiometric ratio of elements in the chemical formula K2Ba7-x-ySi16O40:xEu<2+>, yR<III>, performing grinding and mixing the substances evenly to obtain raw material powder; conducting calcination in reducing atmosphere; performing furnace cooling to room temperature to obtain a calcined product; and conducting grinding to obtain the green silicate long afterglow luminescent material. The luminescent material has good chemical stability and thermal stability, and is stable after encountering water. The preparation method is simple, has no emission of waste water and waste gas, and the prepared long afterglow luminescent material can emit green afterglow continuously.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to a long afterglow luminescent material, in particular to a silicate long afterglow luminescent material which can emit a continuous visible green afterglow after being irradiated by ultraviolet light or visible light; the invention also relates to a long afterglow luminescent material of the Preparation method of luminescent material. Background technique [0002] Long afterglow luminescent material is a kind of photoluminescent material, which generates light when excited by an external light source, absorbs light energy and stores it, and slowly releases the stored energy in the form of light after the excitation stops . As far as the system of long afterglow materials is concerned, the early traditional long afterglow materials are mainly concentrated in sulfide systems such as ZnS and CaS. The advantage of this system is that it has rich luminous colors and can co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
CPCC09K11/7734C09K11/7792
Inventor 王育华郭海洁
Owner LANZHOU UNIVERSITY
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